Friction-brake.



No. 719,853. 1 PATENTED mm, 190s.

` 11. R. Q sGooD.

1 41111011011 BRAKE.

APPL'IOATION FILED MA1? 9, 1902. No MODEL. z SHEETS-SHEET 1.

1HE Annals PETERS :0. Mofo-Limo., WASHINOYPNWQ "PMENTBDF513.e., 19,03.

R. R. osGooD.

PRIGTIONBRAKE.

Y APPLICATION FILED MAY 9, 19,02.`

z SHEETS-SHEET 2,`

NO MODEL.

311 vanfofz m: Noms paens Punto-Limo. wAsHmson. u. c4

NiTEn STATES PATENT OFFICE.

RALPH R. OSGOOD, OF UPPER TROY, NEV YORK.

FRlCTlON-BRAKE.

SPECIFICATION forming' part of Letters Patent No. 719,853, datedFebruary 3, 1903. Application led May 9, 1902. Serial No. 106,531. (Nomodel.)

To all whom, it may concern:

Be it known thatI, RALPH R. OsGooD, a citizen of the United States,residing at Upper Troy, in the county of Rensselaer and State of NewYork, have invented certain new and useful Improvements inFriction-Brakes and I do declare the following to be a full, clear, andexact description of the invention, such as willenable others skilledi'n the art to which it appertains tomake and use the same.

This invention relates to improvements in friction-brakes of thatcharacter in which a band is employed to act upon a brake-Wheel.

The object of the invention is to provide a brake of this kind which issimple, strong, and durable, which gives a practically continuousbraking-surface, which is anchored by means applied directly to theband, which gives substantially the same holding power at all points andin either direction of rotation of the brake-wheel, and which is freefrom the many objections incident to prior braking devices of thischaracter.

The invention consists of certain novel features and parts andcombinations of the same,

y as will be fully described hereinafter and then pointed out in theclaims.

A practical embodiment of the invention is represented in theaccompanying drawings, in which similar characters of referencedesignate corresponding parts throughout the several views.

Figure l is a view in side elevation, parts appearing in section, of afriction-brake embodying my invention. Fig. 2 is an end view of thesame. Figs. 3 and 4 are views similar to Fig. l, showing modificationsin the construction of the brake.

Referring to Figs. 1 and 2 of the drawings,4

band 4 is connected at one end with a blockV or shoe 6 and at theopposite end with a iioating operating-lever 7. As shown clearly in Fig.l, the block or shoe 6 approximately fills the space between the ends ofthe band when the latter is applied to grip the wheel and is `formedwith a slot 8 to receive a pin or bolt 9, fixed to the support 1,whereby said block is held from moving around with the wheel 2, exceptto a limited initial extent, in shifting the point of anchorage, ashereinafter set forth, but is adjustable toward and from said wheel. Oneend of the band has pivoted thereto at 10 a bolt 11, which passesthrough an eye or socket 12 on the block or shoe and is adjustablysecured by nuts 13, While the opposite end of the band is connected by alink 14 with the lever 7. The lever is pivoted, as at 15, to the block 6at the end of the latter opposite the point of attachment to the bolt11, so that the points of connection of said bolt and lever are onopposite sides of the slot 8. p

The position of the lever 7 and band 4 (shown in full lines in Fig. l)is the position which these parts will take automatically when thebrake-wheel rotates to the left, owing to the drag of the band upon themoving wheel. When pressure is applied to the lever when in thisposition, both ends of the band are drawn upon to bind the band tightlyagainst the wheel, and at the same time the block or shoe 6 will beforced into engagement with the wheel to augment or supplement thebraking action of the band. By thus drawing the ends of the bandtogether and simultaneously forcing the block against the periphery ofthe wheel both ends of the band exert substantially the same pressureand holding` power, making the braking action uniform, while the blockor shoe coperates to provide a practically continuous braking-surface.It will be noticed that in this position the block serves as the anchor,since the upper end of the slot 8 engages the pin or bolt 9.

Hung upon the pivot 16, which connects the link 14 with the band, areanchor-links 17,' which are formed at their free ends with slots 18,receiving the pin or bolt 9, said links being arranged on opposite sidesof the shoe 6. These slots or openings 18 allow the links to havefreedom of motion in the adjustment of the lever. When the brake-wheelis reversed-that is, when it turns to the rightthe drag of the band uponthe rotating wheel will automatically shift or throw the lever 7 andband4 to the position shown in dotted IOO lines in Fig. 1, and when power isapplied to the lever when in this position the lower ends of the linkscontact with the pin or bolt 9 and anchor the band securely againstmovement in that direction. On the other hand, as before stated, whenthe Wheel turns to the left the upper end wall of the slot in thebrakeshoe comes into contact with the pin or bolt 9 and anchors the bandagainst movement in` that direction. By the provision of these links itwill be seen that the strain upon the shoe is the same in eitherdirection of rotation of the wheel and that by thus shifting theanchorage from, one end of the band to the other the holding power isequalized in both directions and excess power is carried and utilized onthat end of the band that drags away from the anchor. Furthermore, itwill be noticed that in either direction of rotation of the brake-wheelthe lever and band will automatically assume the position to apply thebraking power for that direction and should a certain pressure beapplied to the lever when the wheel turns to the left the reversing ofthe wheel to the right simply shifts the point of anchorage from one endof the band to the other and does not relieve the pressure or frictionof the band and shoe upon the wheel-that is to say, the same brakingpower will be maintained after the wheel has been reversed as wasapplied before the reversing.

In the construction shown in Fig. 3 the links 17 are dispensed with andthe lever is adjustably connected to the block or shoe 6 by means of apin or bolt 18, adapted toengage either one of a series of openings 19in said shoe. In this modification a double adjustment is providedfor toenable the band to be taken up to a maximum` extent to compensate forwear; but the construction of the band and brake-shoe and manner ofconnecting the same to the lever are the same. Thus in bothconstructions it will be seen that a powerful and effective leverage maybe exerted to lock the friction-wheel against movement, that the levermay be adjusted to coinpensate for wear and variations in the length ofthe band, and that the block 6 is adapted to subserve the function of abrake-shoe, thus increasing the friction between the brake members andpower of the brake, so that the movement of the wheel may when requiredbe quickly arrested.

In some cases the block may be secured directly upon one end of theband, as shown by the block 6 in Fig. 4, and the lever pivotallyconnected with both ends of the band,

f and the link 14 may also be provided with a turnbuckle 14C', all asshown in said figure, whereby the parts may be adjusted to compensatefor variations in the length of the band and the anchoring purposes ofthe block utilized without the necessity of employing the same as abrake-shoe. This construction provides a brake which is efficient forlighter work than the devices shown in Figs. 1, 2,

and 3 and yet is adapted-to furnish a comparatively heavy frictionaction on the brakewheel.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought that the construction, mode ofoperation, and advantages of my improved friction-brake will be readilyunderstood Without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted'to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is- I l. In a friction-brake, a support, abrakewheel, a brake-band to engage the Wheel, means for permitting theband to have a limited circumferential movement with the wheel and foranchoring the band to the support and transferring the anchorage fromone to the other end of the band under the drag of the band upon thewheel as the latter rotates in one direction or the other, and means forvariably adjusting the band when anchored at either end to bear withgreater or less force or pressure upon the brake-wheel, said means beingadapted to permit of such limited circumferential movement of the bandwithout interference, substantially as described.

2. In a friction-brake, a support, a brakewheel, a brake-band to engagethe wheel, means for permitting the band to have a limitedcircumferential movement with the wheel and for anchoring the band tothe support and transferring the anchorage from one to the other end ofthe band under the drag of the band upon the wheel as the latter rotatesin one direction or the other, and means for applying the band, saidmeans being movable with the band as the latter is adjustedcircumferentially to change the point of anchorage from end to end ofthe band, substantially as described.

3. In a friction-brake, a support, a brakewheel, a brake-band to engagethe Wheel, a brake-block having a limited adjustable anchorageconnection with the support to move a prescribed distance in thedirection of revolution of the wheel to allow the band to have a limitedcircumferential movement with the wheel and to anchor one end of theband to the support, means for connecting the other i end of the band tothe support to also permit of such circumferential movement of the bandand to anchor the opposite end of the band to the support, and aband-applying device independent of connection with the support andmovable circumferentially with the band, substantially as set forth.

et. In a friction-brake, the combination of a support, a brake-wheel, abrake-band to engage the wheel, a floating lever for applying the band,and means independent of the lever for anchoring the band tothe support,

IOO

Iss

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whereby the` dragging strain of theband is removed from the lever andtransferred to the support, allowing all the power applied to the leverto be employed to apply the band.

5. In a friction-brake, the combination of a support, a brake-Wheel, abrake-band to engage the wheel, means for anchoring one end or the otherof the band to the support according to the direction of rotation of thewheel While allowing the band as a Whole to have a limitedcircumferential movement under the drag of the wheel, a lever forapplying the band, and a fulcrum for the lever shiftablecircumferentially with the band, substantially as described.

6. In a friction brake, a brake wheel, a band to engage the same, abrake-shoe connected to one end of the band and anchored to the supportto prevent rotation of the band but to move toward and from thebrake-Wheel, an operating-lever connected to the brakeshoe and oppositeend of the band, and links 17 connected to the latter-named end of theband and support for transferring the anchorage to said end of the bandwhen the rotation of the brake-Wheel is reversed, substantially as setforth. v

7. In a friction-brake, a support, a brakewheel, a band to engage thesame, a brakeshoe connected to one end of the band and anchored by aslot-and-pin connection to the support to prevent rotation of the bandbut to move toward and from the brake-Wheel,

an operating-lever connected to the brakeshoe and opposite end oftheband, and links 17 connected to the latter-named end of the band andhaving a slot-and-pin connection at their opposite ends with the supportand adapted to automatically transfer the anchorage to said end of theband When the movement of the brake-Wheel is reversed, substantially asset forth.

8. In a friction-brake, the combination of a support, a brake-Wheel, abrake-band to engage the wheel, a brake-block anchored to the supportand linked to one end of the band,

RALPH R. OSGOOD.

Witnesses:

CORNELIUS A. WALDRON, FRANK A. WALDRON.

